Tractor.



c. JOHNSON. TRACTOR.

APPLICATION FILED AUG.26, I916.

299,851. Patented Apr. 1,1919.

an ens QFFLQEO ALFRED C. JOHNSQN, 0F WINTERS, CALIFORNIA, AEQSXGNOR TOY'U'BA MANUFACTURING CUEEETAIW, OF SAN FRANCISCO, CALIFOENEA, ACQRPOMTIQN 0F CALIFORNIA.

TRACTOR.

Specification of Letters Patent.

original application tiled February 2, 1914, serial No 816,034. Dividedand this application filed August 26, 1916. Serial No. 11?,0 36.

To all whom it may concern:

Be it known that I, ALFRED C. JoHnsoN, a citizen of the United States ofAmerica, residing at Winters, in the county of Yolo and State ofCalifornia, haveinvented certain new and useful Improvements inTractors, of which the following is a specification, reference being hadtherein to the accompanying drawings. 4

This invention relates to tractors and refers more particularly to atractor adapted to pull a plow or other farm implement, although theinvention in its broader aspects is not limited to the particular usespecified.

Among the objects of the invention are to provide improved means forsecuring the plow or other load to the tractor so that when there is anexcessive pull through the connection the load will be automaticallydisconnected from the tractor; to provide a construction which can beemployed interchangeably with various farm implements of standardconstruction and in'general to provide a new and improved connectingdevice for tractors.

The invention also resides in such details of construction andarrangements and combinations of parts as will more fully hereinafterappear, this application being a divisional of my application, SerialNo. 816,034, filed February 2, 1914.

In the drawings, j I

Figure 1 is a side elevation of the rear portion of a tractor showing aplow attached; I

Fig. 2 is an enlarged cross section through the automatic release forthe load.

In the construction shown in the draw-' ings, the main frame A of thetractor has a rear portion B which is supported by a subframe B securedat one end to the main frame by a pivotal connection B The subframeextends diagonally downward from' the main frame and has its lower endadjustably spaced therefrom by a bar E. A plurality of apertures E areprovided in the spacer bar E, these apertures being engaged by bolts Eand E which pass through apertures in the main frame and sub-framerespectively. The rear end of the main frame is raised or loweredaccording to which apertures in the bar are engaged by the bolts E andE.

A suitable steering wheel F and seat F strains arising from theplow-shares striking stones, stumps, or the like. As shown in detail inFig. 2, the plow-beam O has slidably sleeved upon its forward end aninner bearing member 0 A bolt W secured to the forward end of theplow-beam projects through an aperture in the forward end of the bearing0' and a heavy spring Y is sleeved upon the bolt W and has its oppositeends bearing against the inner bearing member 0 and an adjustable nut Zon the end of the bolt. This spring is sufiiciently heavy to normally?prevent any material relative movement etween the plow-beam 0 and theinner bearing member 0 This latter-mentioned member is adapted to extendwithin an outer bearing member 0 carried by the frame J A lever R ispivoted at R to the outer bearing member 0' and carries. a locking dog Pextending through registering apertures in the bearings O and normallylocking the same from relative movement. When, however, the spring Y isplaced under abnormal compression, it will permit sufficient relativemovement between the beam 0 and the inner bearing 0 to cause the camsurface R to raise the lever R through the lug R to release the dog 1?from the inner bearing member 0 This will result in automaticallyreleasing the plow or other member secured to the beam 0 and willprevent injury to the tractor.

The amount of pull necessary to compress the spring Y can be controlledby adjusting the nut Z either toward or from the bearing 0. Various farmimplements may be provided with securing portions having the camsurfaces R and the inner bearing member 0 so that they may be usedinterchangeably with the frame J. Also otherloads than farm implementscan be employed as the invention contemplates the automatic releasing ofany load from the tractor and the invention also resides in the use ofany adjusting means for controlling the amount of pull necessary toautomatically release the load from the tractor.

Patented a a, rare.

- inner her and movable relatlvethereto 1n the d1- What I claim as myinvention is: I 1. The combination with a, tractor-frame having a hollowbearing, and a' draft memher to be secured thereto, of meansfor secilrinsaid members together comprising an aring mounted upon the draftmemrection of draft, a heav spring interposed between the draft mem erand said inner bearin resisting relative movement thereof g in thedirection of draft, the draft member havin a cam'surface, and a lockingdog earrie engage sald inner bearing and having a pertion adapted toengage said cam surface and. releasable thereby upon an abnormal pull onby. the frame bearing adapted to agement with said casing, and a draftmemer positioned in said casing yieldably held in relation thereto, andhaving acam surface for lifting said locking projection upon apredetermined movement, of said draft member relative to said casing.

3. The combination witha tractor and a draft member, the latter beingprovided with a cam surface, of a member mounted on the draft member andmovable in the direction of draft, a spring yieldably resisting relativemovement of the draft member, and said member mounted thereupon, and apawl carrled by the tractor engaging the movable member on the draftmember to transmit draft to the latter, said pawl having a por-v tionengageable with the cam surface of the draft member to release it fromthe member movable on the draft member when the draft member issubjected to an abnormal stress, and a consequentl predeterminedshifting thereof relative to the movable member carried thereby. I

In testimony whereof I affix my signature.

ALFRED Cl JOHNSON.

